In this paper, considering the temperature characteristics relevant to the climatic conditions of our country, an experimental study was conducted to investigate whether the electrical characteristics of transformer insulating oil vary with changes in electrode configuration and temperature. To achieve this objective, three representative electrode types—the sphere electrode, the plate electrode, and the needle electrode—were selected to simulate the different electric field distributions commonly encountered in transformer systems. Based on these electrode types, six electrode combinations were examined: sphere-sphere, plate-plate, sphere-plate, needle-needle, sphere-needle, and needle-plate configurations. To evaluate the influence of gap spacing on insulation performance for each electrode combination, the distance between electrodes was systematically adjusted in four incremental steps of 1.5, 2.0, 2.5 and 3.0 mm. Furthermore, the ambient temperature of the insulating oil was varied at four levels 0, 10, 20 and 30 °C, to reflect typical operating and environmental conditions. The electrical properties under these conditions were analyzed to determine the combined effects of electrode geometry and temperature variation on the insulating characteristics of transformer insulating oil.

Abstract
1. Introduction
2. Experimental Procedure
3. Results and Discussion
    3.1. Insulation breakdown voltage with ambienttemperature change
    3.2. Temperature change of insulating oil accordingto ambient temperature change
4. Conclusion
Acknowledgement
References
Author Information

• Tae-Hee Kim(Green Energy Institute, Mokpo 58217, Republic of Korea)
• Seo Yeon An(Green Energy Institute, Mokpo 58217, Republic of Korea)
• Geun Ho Gim(Green Energy Institute, Mokpo 58217, Republic of Korea) Corresponding author